As of now, LG Q6 does not support Google VR because of slight different Aspect ratio of 18:9 but both companies are working to over it.
No. LG Q6 does not have dual camera.
No. LG Q6 has 2 Sim card slots and one dedicated memory card slot. So, you can use 2 sim cards and one memory card - all at the same time.
LG Q6 comes with a non-removable 3000 mAh Li-Polymer battery.